samuel



UNITE FFIC. r

A. P. SAMUEL, OF NEW YORK, N. Y.

CUT-OFF FOR STEAM-ENGINES.

Specification of Letters Patent No.

T0 all whom t may conce/rn Be it known that I, AUGUSTIN PETER SAMUEL, ofNewl York, in the county of New York, in the State of New York, haveinvented a new and useful Improvement in Cut-OHs for Steam-Engines; andI do hereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings and to theletters of reference marked thereon.

The nature of my invention consists in making adjustable part of ahelical curve in a rock shaft plate, for varying the cut-0H as may bedesired.

To enable others skilled in the art, to make and use my invention, Iwill proceed to describe its construction and operation.

Figure l, general plan of such invention or arrangement. Fig. 2, view ofthe same detached from the machine, to give a better idea of themechanism and the movement of its pieces. Fig. 3, vertical view of Fig.2 through cL-ZL Fig.4, transversal section of Fig. 2 through c, d.

a crank; m eccentric; e conical knob of the eccentric; c c slides of theknob e of the eccentric; cZ el fixed parts in which the slides c cslide; 3/ frame moving on axle m ac cording to the motion of the knob eof the eccentric; g, s fixed parts of the uniform helical curves, partof the piece y; g, mov able parts of such uniform helical curves,

v and which regulate the extent of the cut off by the right and leftscrew u, fu; a knots of the screw u, o, to move the guides l and 2 andthe parts g, t; Z supports for the guides of the cut off and the screwu, '1),' b o semicircular slides of the curve pieces g, z5, whichproduce the variable cut off.

The crank a is supposed to be at the dead point for the forwardmovement. Suppose its movement to be from a to 1),' at the same momentthe eccentric m will have moved from c to d and the conical knob e ofthe eccentric will have moved from e to f on the fixed helical curve g.The frame y, in which are made the fixed curves g and s, and the movablecurves g and t, which together make up a continuous uniform curve, turnson its axle m', and as the knob e is moved backward and forward by theeccentric m, it causes the part y to rotate back and forward and thus bymeans of the lever L moves the slide valve i. As the conical knob e ofthe eccentric followed a straight line it will have turned the helical19,154, dated January 19, 1858.

curve g, and the lever L will have opened the slide valve t', and thesteam piston will have moved from to 70, and the exhaust valve will bewide open. During this time the eccentricity of the eccentric will havepassed from Z to n. Now the crank continuing its movement from Z) to 0,the eccentric m will pass from ci to 2), and the conical knob e willreturn to its point of departure e. If at this moment the curve g wasmoved opposite the'fixed curve g, the slide valve would thus be shut,and the steam would act t-he remainder of the stroke by expansion, whilethe pitson will have moved from k to fr, that is to say about theone-eighth part of the stroke, thus it would cut off seveneighths. Butas it is proposed to cut off but at a certain degree, it follows thatthe slide valve would not close until it meets the curve g; in thisdisposition the cut off would not take place but at a half stroke of thepiston. If on the contrary it be desired to cut off at the minimum ofthe stroke, the curve g should be placed against the fixed curve s, andin this disposition the cut oftl would take place but at one-eighth ofthe stroke of the piston. The crank continuing its regular movement, theeccentric m will push the knob e toward the curve s, and open the slidevalve for the back stroke of the piston. The operation is the same inthe descending as well as in the ascending stroke.

'The motion is given to the pieces g and t, being the movable parts ofsuch helical curves, by the right and left screw u fu, working the rodsl and 2, and thus pushing and pulling the curves g and t. Said screw u ois worked by a small crank e or by regu lators or governors. Thisdisposition of cut off permits any desired variation, and is applicableto every kind of steam engines, operating every kind or description ofvalve.

Vhat I claim as my invention and desire to secure by Letters Patent, is

The adjustable bars g, t,--making with the helical slot in the rockshaft plate y, a uniform curve-arranged substantially as described,within, or in connection with, such helical curve or slot in such rockshaft y, for varying the cut off, as herein above set forth.

A. P. SAMUEL.

Witnesses:

BER. BEKERMANN, Jr., S. D. LAW.

